Grouting water sealing and reinforcement construction process capable of realizing draining and plugging combined effect for underground water in tunnel

Abstract

The invention discloses a grouting water sealing and reinforcement construction process capable of realizing a draining and plugging combined effect for underground water in a tunnel. The grouting water sealing and reinforcement construction process includes steps of (1), arranging grouting pipes from the inner side to the outer side of the tunnel, simultaneously arranging drain pipes matched with the grouting pipes in the tunnel, connecting the drain pipes with a vacuum pump so as to locally pump the water; (2), diluting sodium silicate of raw grout 39Be' to obtain grout 28Be', mixing TGRM grouting materials with cement according to a proportion of 1:3 to obtain second grout, mixing the grout 28Be' with the second grout according to a proportion of 1:1 to obtain liquid A, diluting sodium silicate of raw grout 39Be' by water to obtain grout 30Be', diluting strong phosphoric acid by water according to a proportion of 1:6 to obtain diluted phosphoric acid, and mixing the grout 30Be' with the diluted phosphoric acid according to a proportion of 1:1 to obtain liquid B; (3), alternately filling the liquid A and the liquid B into reinforcement soil layers outside an excavation range of the tunnel via the grouting pipes to complete grouting for the periphery of the tunnel; and (4), alternately filling the liquid A and the liquid B into a 1.5m range of the periphery of an excavation face via small pipes. The grouting water sealing and reinforcement construction process has the advantages that 'draining' and 'plugging' are combined and work along both lines in the construction process, accordingly, the underground water is prevented from diffusing and permeating to feeble grouted positions, the tunnel construction difficulty is reduced, and the construction safety degree is increased.

Description

【Technical field】 [0001] The invention relates to a building construction method, in particular to a construction technique of grouting, sealing and water-stopping in a tunnel combined with dredging and plugging of underground water. 【Background technique】 [0002] The key to the underground excavation construction of the tunnel is that the tunnel is under the groundwater and in the loose ground, and the tunnel lining construction can be carried out safely under the premise of ensuring the quality through grouting, water sealing and reinforcement. In the tunnel construction under the condition of no precipitation, in the past, the simple grouting was used to block the ground. Since the grouting reinforcement stratum is easily affected by the groundwater pressure, the local water pressure increases, which directly aggravates the weakness of the water layer to the tunnel grouting. The trend of diffusion and infiltration at places has virtually increased the difficulty of const...

AI Technical Summary

Problems solved by technology

In the tunnel construction under the condition of no precipitation, in the past, the simple grouting was used to block the ground. Since the grouting reinforcement stratum is easily affected by the groundwater pressure, the local water pressure increases, which directly aggravates the weakness of the water layer to the tunnel grouting. The trend of diffusion and infiltration at places has virtually increased the difficulty of construction